>>reporter: why hydroelectric power is a big draw for energy intensive industries around the world. >>things like the smelting of aluminium of bauxite you're going to need huge quantities of power andfor that hydropower does seem to be the obvious solution >>reporter: and how social media can be an amazing source of market research, if companies can sort through the vast amounts of consumer comments posted online. >>the scale of data mining is increasing all the time. the cost of, the unit cost of data mining is going down all the time. >>reporter: hello and welcome. i'm raya abirached and this is world business, your weekly insight into the global business trends shaping our lives. at the start of the year egypt surprised the world,by overthrowing the regime of president hosni mubarak. six months on and the country is at a crossroads. the revolution appears to have stalled, parts of the economy have been badly battered and protestors are back in the streets. >>reporter: cairo in july. the arab spring has given way to the arab summer. the city is boiling hotbut despite the heat hund